Valve-operating mechanism.



G. W. DUI TEAM. VALVE OPERATING MECHANISM.

APPLICATION FILED APR. 23, 1906.

Patentediune 1, 1909.

WITNESSES the collar I constantly against the key memerating Mechanism, of which the following is mechanism for explosion engines, and con- UNITED STATES PATENT OFFICE.

GEORGE W. DUNHAM, OF LANSING, MICHIGAN, ASSIGNOR 'lO OLDS MOTOR WORKS. OF LAN- SING. MICHIGAN, A CORPORATION ORMICHIGAN.

VALVE-OPERATIN G MECHANISM.

Specification of Letters Patent. 2

Patented June 1, 1909.

Application filed April 23, 1906. Serial No. 313,215.

To all whom it may concern:

Be it known that I, GEORGE W. DUNHAM, a citizenof the United States of America, re siding at Lansing, in the county of Ingham l and State of Michigan, have invented certain new and useful Improvements in Valve-Opa' s ecification, reference being had therein to t e accompanyin drawlngs.

The invention relates to valve-operating sists in the novel construction, arrangement and combination of parts as hereinafter set forth. Y

In the drawings, Figure 1 is a central lon gitudinal section through the valve and its operating stem; and Fig. 2 is a perspective view of the parts forming the spring abutment for the valve stem.

A is the valve and B is the valve seat there-' for formed on the casing C.

D is a valve stem passing out through a gland E in the casing, and F is a spring sleeved upon this stem and acting to hold the valve normally to its seat.

One of the features of my invention is the means employed for forming the abutment for the sprin upon the valve stem D, the construction being as follows The valve stem is cut away at G, preferably by forming an annular gland therein, so as to form the opposed shoulders a b. H are segmental key members adapted for engagement with the recess G, and I is a collar apertured at J to sli over the valve stem, and having a socket l for receiving the key members H. With this construction, the parts may be assembled by, first, slipping the valve stem D through the gland E, then sleeving the spring F and the collar 1 thereon and ressing them u ward beyond the recess G, a er which the ey members H may be engaged with the recess, and the collar I ermitted to move outward to en agesaid 'ey members with the recess J Vl /hen thus assembled, the tension of the spring F will hold bers H, while the latter, being in the socket J, are revented from disengaging with the recess The valve is operated by a suitable cam L, driven by connections with the engine (not shown). This cam actuates the stem D tion. -abutment upon the. stem M for the spring P through the medium of a rod M, the outer end of which is provided with an antifricl tion roll N for bearing against the cam, and the lnner end normally in contact 01 close proximity to the end of the stem D. The

rod Misguided in a suitable casing O secured to the main engine casing (not shown), the

roll N engaging a slot in said casing O and serving to hold the rod from rotary movement. P is a spring sleeved upon the rod M outside of the casing O, acting to force said rod toward the stem D.

To prevent pounding and the consequent wear of parts, 1t is essential that the ends of the stem D and rod M should be either in contact or in very close proximity, and at the same time it is equally important that the valve A should be free to find its seat. I have therefore provided an adjustable portion on the end of the rod M, which may be moved toward or from the end of the valve stem, the construction being as follows Q is a threaded portion at the end of the stem M R is a member which is internally threaded to engage the threaded portion Q, and is externally rovided with a tapering thread 0. The t eaded portion of this member is split at d, and S is a clamping nut externally engaging the tapering thread 0. This construction permits of adjusting the member R longitudinally upon the stem M, so that its outer end may be arranged in the desired relation to the end of the valve stem D. After such an adjustment and by screwing upthe nut S upon the ta ering thread, the split portion of the mem er R may be firmly clamped upon the threaded portion of the stem, so as to prevent change in pos1- The member R further acts as an and, to protect said spring, a shield or hood T is sleeved on the stem between the sprlng and member R, and telescopically engages the end of the casing 0, thereby forming a housing for the spring.

What I claim as my invention is 1. In a valve operating device, the combination with a valve stem and a spring sleeved thereon, of a bearing for said sprlng upon said stem comprising a two-part key member engaging a recess in said stem and projecting outward therefrom, and acollar apertured to fit over said stem com rismg an annular longitudinally extending ody ortion engaging the sides of said key mem er, 1 an annular flange projecting outwardly from v one end of said body portion, and formlng a eaaeaa seat for said s )riii'g, and an inwardly extendflange upon the upper portion oi -said collar,

-ing annular ange on the other end of said and an outwardly projecting annular flange 1-5 1 upon the lower portion of said collar forming a seat for said spring, the sides of said collar 1 serving as a bearing for the spring to hold the 3 same from lateral movement.

In testimony whereof I aflix my signature 20 body portion member.

2. In a valve-operating device the combination with a valve stem and a spring sleeved thereon, of a bearing for said sprihg I engaging the top of said key upon said stem comprising a key member en-' in presence of two witnesses.

gaging a recess in said stem and projecting outward therefrom, a collar apertured to longitudinally engage said stem and havin a socket portion embracing said key mem er I formed by aninwardly projecting annular i g v GEORGE W. DUNHAM. l/Vitnesses:

CHAs. D. HASTINGS,

AR HUR MITCHELL. 

